"alias" directive may not be used inside location given

[Fernando Perez]

I don't understand the following error:

the "alias" directive may not be used inside location given by regular
expression

>From the docs it seems possible:
http://wiki.nginx.org/NginxHttpCoreModule#alias

I'm running 0.7.38

Here is my conflictual declaration:

location ~* ^/uploads/([\w\-\/]+\.(jpg|m4v|mp4|ogv|png)) {
  alias  $rails_path/uploads/production/$1;
}


I want to map the request /uploads/assets/myfile.png to
/uploads/production/assets/myfile.png on disk


Thanks
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